There are basically three kinds of people I follow: people from the Smalltalk world (or closely related tech guys), people from my musical background, and friends and acquaintances from my town.

From the Smalltalk world, I'm pretty much interested in every single tweet. Besides, people in this group don't tweet that much.

As for musicians and bands, we usually follow each other in order to stay aware of gigs, recordings, etc. But following is also an act of befriending, so there are bands and individuals who tweet way too much but to whom I still want to show interest, so I can't unfollow them.

Friends and acquaintances from my town, however, you've got to follow them... and some of them are really annoying. I don't want to unfollow them because, as OP said, «few of them might get offended and then your relations might ruin or something like that». If you live in a small enough town, you'll know what I mean :)

Thanks, that's interesting, and makes me realise how much my Twitter use is conditioned by being pseudonymous and, as a result, almost entirely freely-chosen relationships. I only really follow people because I'm interested in what they have to say, not because I have some other connection to them; but if people who I know in some other context could find me on Twitter, I guess I might find myself in the same position as you.

IMO people get slightly offended/feel bad if you unfollow them.

But as a gesture of politeness, you might want to follow someone who has followed you and is close to you, but at the same time you would not want to listen to all his tweets, in that case, silence might work, and not unfollowing.

Make a private list "My real timeline", with the people you really want to read.